I'll do the first one:
Both novels.
Student 1 picks a novel. There are 3 novels out of 6 books total.
Now there are 5 books left.
Student 2 picks a novel. There are 2 novels out of 5 books since the other student took a novel.
To find the probability you would multiply the probability student 1 gets a novel and the probability student 2 gets a novel.
So the probability is 1/5. Or 20%
So, at the beginning there are a total of 25*3=75 siblings (we can assume that each of them had exactly 3 siblings, that's what average means; that we can assume this).
Now we have 25+1=26 students and the number of siblings is 75+8=83
and the average is
, and rounded it's 3.19.
96
48 * 2
24 * 2 * 2
8 * 3 * 2 * 2
4 * 2 * 3 * 2 * 2
2 * 2 * 2 * 3 * 2 * 2
2^5 * 3 <==
2.10 + 4.60e = 15.90
4.60e = 13.80
e = 3
You bought 3 erasers
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